In a brief chat with the Los Angeles Times, Nolan said, "Harvey Dent is a tragic figure, and his story is the backbone of this film." As all Bat-fans know, the handsome and politically ambitious Dent is destined to become the scarred supervillain Two-Face. It is believed that Two-Face will be the main villain in the next sequel.

"The Joker, he sort of cuts through (The Dark Knight)," Nolan explained. "He's got no story arc, he's just a force of nature tearing through. Heath has given an amazing performance in the role, it's really extraordinary."

"It's a dark and complex story," Nolan added, "and the villains are dark and complex as well."

The Times also confirms rumors that made the rounds online last year that Cillian Murphy will reprise his role from Batman Begins as The Scarecrow in The Dark Knight.